Chii chinonzi SCH (Nhamba Yechirongwa)?

SCH inomiririra "Schedule," inova nzira yekuverenga nhamba inoshandiswa muAmerican Standard Pipe System kuratidza ukobvu hwemadziro. Inoshandiswa pamwe chete ne nominal dhayamita (NPS) kupa sarudzo dzakajairwa dzeukobvu hwemadziro emapombi ehukuru hwakasiyana, zvichiita kuti zvive nyore kugadzira, kugadzira, uye kusarudzwa.

 

SCH hairatidzi zvakananga ukobvu hwemadziro asi inzira yekuyera inoenderana nehukobvu hwemadziro hwakatarwa kuburikidza nematafura akajairwa (semuenzaniso, ASME B36.10M, B36.19M).

 

Muzvikamu zvekutanga zvekuvandudzwa kwechiyero, fomura yekufungidzira yakakurudzirwa kutsanangura hukama huripo pakati peSCH, kumanikidzwa, uye simba rezvinhu:
SCH ≈ 1000 × P / S
Kupi:
P — Kumanikidzwa kwedhizaini (psi)
S — Kumanikidzwa kunobvumirwa kwezvinhu (psi)

 

Kunyangwe fomura iyi ichiratidza hukama huripo pakati pekugadzirwa kweukobvu hwemadziro nemamiriro ekushandiswa, pakusarudza chaiko, ukobvu hwemadziro hunoenderana hunofanira kutariswa kubva pamatafura akajairwa.

 

Mavambo uye Maitiro Akafanana eSCH (Nhamba Yechirongwa)

Sisitimu yeSCH yakatanga kuumbwa neAmerican National Standards Institute (ANSI) uye yakazoshandiswa neAmerican Society of Mechanical Engineers (ASME), yakabatanidzwa muB36 series of standards, kuratidza hukama huripo pakati pehukobvu hwemadziro epombi nedhayamita yepombi.

 

Parizvino, zviyero zvinowanzo shandiswa zvinosanganisira:

ASME B36.10M:
Inoshanda pamapombi esimbi yekabhoni uye alloy, inofukidza SCH 10, 20, 40, 80, 160, nezvimwewo;

ASME B36.19M:
Inoshanda kumapaipi esimbi isina ngura, kusanganisira akareruka akadai seSCH 5S, 10S, 40S, nezvimwewo.

 

Kuunzwa kwenhamba dzeSCH kwakagadzirisa nyaya yekusaenderana kwehukobvu hwemadziro padhayamita dzakasiyana, nokudaro zvichiita kuti dhizaini yemapaipi ive yakaenzana.

 

SCH (nhamba yechirongwa) inomiririrwa sei?

Mumitemo yeAmerica, mapaipi anowanzo shandiswa uchishandisa fomati yekuti “NPS + SCH,” yakaita seNPS 2" SCH 40, zvichiratidza pombi ine dhayamita ye2 inches uye ukobvu hwemadziro hunoenderana neSCH 40 standard.

NPS: Saizi yepombi yemhando yepamusoro, inoyerwa nemainji, iyo isiri dhayamita chaiyo yekunze asi chiratidzo cheindasitiri. Semuenzaniso, dhayamita chaiyo yekunze yeNPS 2" inosvika mamirimita makumi matanhatu nematatu.

SCH: Kukura kwemadziro, uko nhamba dzakakwira dzinoratidza madziro akakora, zvichikonzera simba guru remapaipi uye kuramba kumanikidzwa.

Uchishandisa NPS 2" semuenzaniso, ukobvu hwemadziro enhamba dzakasiyana dzeSCH ndeinotevera (mayuniti: mm):

SCH 10: 2.77 mm
SCH 40: 3.91 mm
SCH 80: 5.54 mm

 
【Chinyorwa Chinokosha】
— SCH ingori chiratidzo, kwete kuyera zvakananga ukobvu hwemadziro;
— Mapaipi ane zita reSCH rakafanana asi saizi dzakasiyana dzeNPS dzine ukobvu hwakasiyana hwemadziro;
— Kana chiyero cheSCH chakakwira, madziro epombi anokora uye chiyero chekumanikidzwa kwakakodzera chakakwira.